//AudioMgr.ts
import { Node, AudioSource, AudioClip, resources, director } from "cc"
/**
 * @en
 * this is a sington class for audio play, can be easily called from anywhere in you project.
 * @zh
 * 这是一个用于播放音频的单件类，可以很方便地在项目的任何地方调用。
 */
export class AudioMgr {
  private static _inst: AudioMgr
  public static get inst(): AudioMgr {
    if (this._inst == null) {
      this._inst = new AudioMgr()
    }
    return this._inst
  }

  private _audioSource: AudioSource
  constructor() {
    //@en create a node as audioMgr
    //@zh 创建一个节点作为 audioMgr
    let audioMgr = new Node()
    audioMgr.name = "__audioMgr__"

    //@en add to the scene.
    //@zh 添加节点到场景
    director.getScene().addChild(audioMgr)

    //@en make it as a persistent node, so it won't be destroied when scene change.
    //@zh 标记为常驻节点，这样场景切换的时候就不会被销毁了
    director.addPersistRootNode(audioMgr)

    //@en add AudioSource componrnt to play audios.
    //@zh 添加 AudioSource 组件，用于播放音频。
    this._audioSource = audioMgr.addComponent(AudioSource)
  }

  public get audioSource() {
    return this._audioSource
  }

  /**
   * @en
   * play short audio, such as strikes,explosions
   * @zh
   * 播放短音频,比如 打击音效，爆炸音效等
   * @param sound clip or url for the audio
   * @param volume
   */
  playOneShot(sound: AudioClip | string, volume: number = 1.0) {
    if (sound instanceof AudioClip) {
      this._audioSource.playOneShot(sound, volume)
    } else {
      resources.load(sound, (err, clip: AudioClip) => {
        if (err) {
          console.log(err)
        } else {
          this._audioSource.playOneShot(clip, volume)
        }
      })
    }
  }

  /**
   * @en
   * play long audio, such as the bg music
   * @zh
   * 播放长音频，比如 背景音乐
   * @param sound clip or url for the sound
   * @param volume
   */
  play(sound: AudioClip | string, volume: number = 1.0) {
    if (sound instanceof AudioClip) {
      this._audioSource.stop()
      this._audioSource.clip = sound
      this._audioSource.play()
      this.audioSource.volume = volume
    } else {
      resources.load(sound, (err, clip: AudioClip) => {
        if (err) {
          console.log(err)
        } else {
          this._audioSource.stop()
          this._audioSource.clip = clip
          this._audioSource.play()
          this.audioSource.volume = volume
        }
      })
    }
  }

  /**
   * stop the audio play
   */
  stop() {
    this._audioSource.stop()
  }

  /**
   * pause the audio play
   */
  pause() {
    this._audioSource.pause()
  }

  /**
   * resume the audio play
   */
  resume() {
    this._audioSource.play()
  }
}
